Today's thing has been troubleshooting the TC430HX motherboard I posted about a few days ago - after being able to install Windows, it got worse with each boot up and I've had lots of trouble with it since. Some of which turned out to be caused by a troubled CF card, or maybe a bad power supply, or maybe bad caps. I replaced the 4 capacitors around the power / memory area, which seems to have helped it being stable.
I at one point thought maybe the L2 cache was bad, but it turns out that was fine. It did lead me to open up the Deschutes 333 processor I have but haven't been able to use for lack of a SECC1 heatsink. Then I decided to also open up my Klamath 233 processor from the Dell XPS 233 machine, which I replaced with another Deschutes 333 that doesn't quite fit / have the right cooling.
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With both of them apart, I swapped the metal plate with the big heatsink attached and moved it from the Klamath 233 to the Deschutes 333, with some fresh thermal paste and some thermal pads for the cache chips 😀
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Now the heatsink on the Deschutes 333 fits the Dell XPS 233 and it has the best Pentium II CPU the motherboard can have
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The Intel TC430HX board, now it's working - Its onboard sound is less great than I thought. The SB Pro support of the first yamaha OPL3-SAx chip (ymf701?) is pretty glitchy - I wonder if I could swap it with a YMF718 chip? They should be pin compatible, but I wonder if it would just work